bad throughput performance on multiple systems: Re: Fwd: Re: Disappointing packets-per-second performance results on a Dell,PE R530

[Navdeep Parhar]

On Mon, Mar 13, 2017 at 10:13 AM, John Jasen <jjasen at gmail.com> wrote:
> On 03/13/2017 01:03 PM, Navdeep Parhar wrote:
>
>> On Sun, Mar 12, 2017 at 5:35 PM, John Jasen <jjasen at gmail.com> wrote:
>>> UDP traffic. dmesg reports 16 txq, 8 rxq -- which is the default for
>>> Chelsio.
>>>
>> I don't recall offhand, but UDP might be using 2-tuple hashing by
>> default and that might affect the distribution of flows across queues.
>> Are there senders generating IP fragments by any chance (that'll
>> depend on the "send size" that your UDP application is using)?
>
> No, they're not fragmenting.
>
>> Have you tried limiting the adapter's rx ithreads to the CPU that the
>> PCIe slot with the adapter is wired to?
>
> Above and beyond the use of cpuset, you mean?

I meant cpuset.

If possible, try your experiments on a single socket system.

Regards,
Navdeep